Compatibility of Curving Performance and Hunting Stability of Railway Bogie

2021 ◽  
pp. 740-748
Author(s):  
Akira Matsumoto ◽  
Yasuhiro Sato ◽  
Hiroyuki Ohno ◽  
Yoshihiro Suda ◽  
Ryu-Ichi Nishimura ◽  
...  
Keyword(s):  
Curving Performance ◽  
Railway Bogie ◽  
Hunting Stability

Compatibility of Curving Performance and Hunting Stability of Railway Bogie

1999 ◽  
Vol 33 (sup1) ◽  
pp. 740-748 ◽  
Author(s):  
Akira Matsumoto ◽  
Yasuhiro Sato ◽  
Hiroyuki Ohno ◽  
Yoshihiro Suda ◽  
Ryu-Ichi Nishimura ◽  
...  
Keyword(s):  
Curving Performance ◽  
Railway Bogie ◽  
Hunting Stability

Multibody Dynamics Simulation and Bogie Structure Evaluation for Active-Bogie Steering Truck

2007 ◽  
Author(s):  
N. Miyajima ◽  
A. Matsumoto ◽  
Y. Suda ◽  
Y. Sato ◽  
H. Ohno ◽  
...  
Keyword(s):  
Traffic Safety ◽  
High Speed ◽  
Dynamics Simulation ◽  
Transition Curve ◽  
Steering Control ◽  
Active Steering ◽  
Steering Mechanism ◽  
Curving Performance ◽  
Hunting Stability ◽  
Structure Evaluation

Railway truck is necessary to have excellent curving performance as well as high speed hunting stability, but generally they are contrary to each other. In order to realize the compatibility, many trucks with passive steering mechanism have been studied, and some of them are realized on service operation. In order to realize further improvement of bogie steering ability on sharp curve, active steering control can give effective performance, and is considered as the latest topic. As an example of the active steering bogie, the bogie with actuators between wheelsets and bogie frame is considered. The bogie mechanism realizes effective steering but requires many actuators results in complex mechanism. The truck treated here has simple but effective mechanism: Actuators are attached only between car body and truck frame. When railway trucks negotiate sharp curve running, the rolling radius difference between inside and outside wheels cannot be obtained sufficiently, and the attitude of the truck becomes so-called “insufficient steering condition”. Considering the phenomena, if the truck frame is steered by actuators toward “radial steering position of the truck”, the improvement of curving performance of the truck can be realized. This is the first concept of active-bogie-steering (ABS) truck. In this paper, detailed study and evaluation for ABS (Active-Bogie-Steering) bogie will be presented. Validity tests were carried out with the bogie on rolling test stand in NTSEL (National Traffic Safety and Environment Laboratory), which can simulate curve-running condition including transition curve. Bogie parameters and steering actuator characteristics are elaborately identified in order to compare the experimental results with multi-body dynamics simulation. According to the test results and numerical simulation, the effectiveness of the proposed bogie mechanism and control are proved.

Investigation Into the Effects of Geometric Tolerances on Freight Car Dynamics

2006 ◽  
Author(s):  
John Tunna ◽  
Xinggao Shu ◽  
Jeremy Dasher
Keyword(s):  
Dynamic Performance ◽  
Simulation Software ◽  
Variable Load ◽  
Test Cases ◽  
Research Initiative ◽  
Manufacturing Tolerances ◽  
Freight Car ◽  
Curving Performance ◽  
Hunting Stability ◽  
Initiative Program

When a 3-piece truck is assembled there are clearances between components that are intended to allow relative movement, and to limit excessive movement. The magnitudes of the clearances are affected by manufacturing tolerances and wear in service. They have important effects on freight car dynamics including hunting stability and curving performance. A study has been made of the effect of varying clearances on the dynamic performance of a typical freight vehicle. The clearances that have been considered are in the areas of the: • sideframe window, • pedestal and bearing adapter • gibs • wheel diameters Combinations of maximum and minimum allowable tolerances and maximum allowable wear have been modeled with TTCI's NUCARS™ simulation software. Most of the test cases in the Association of American Railroads Manual of Standards and Recommend Practices, Chapter XI (1) have been studied. Results were produced from a NUCARS™ model of a 100 ton coal hopper. Empty and loaded simulations were performed. The trucks were modeled with variable load friction wedges. Conclusions have been drawn on the appropriateness of the currently allowable tolerances and wear limits. A new tolerance is suggested for the center of the sideframe window relative to the centerline of the pedestals. The conclusions only apply to the specific vehicle, suspension type and truck type analyzed. This work was sponsored by the Association of American Railroads, Strategic Research Initiative program.

Tribology of rail bogie

2018 ◽  
Vol 77 (4) ◽  
pp. 230-240
Author(s):  
D. P. Markov
Keyword(s):  
Contact Fatigue ◽  
Basic Element ◽  
Difficult Problem ◽  
Railway Track ◽  
Rolling Stock ◽  
Kinematic Parameters ◽  
Approximate Estimation ◽  
Railway Bogie ◽  
Classical Calculation

Railway bogie is the basic element that determines the force, kinematic, power and other parameters of the rolling stock, and its movement in the railway track has not been studied enough. Classical calculation of the kinematic and dynamic parameters of the bogie's motion with the determination of the position of its center of rotation, the instantaneous axes of rotation of wheelsets, the magnitudes and directions of all forces present a difficult problem even in quasi-static theory. The paper shows a simplified method that allows one to explain, within the limits of one article, the main kinematic and force parameters of the bogie movement (installation angles, clearance between the wheel flanges and side surfaces of the rails), wear and contact damage to the wheels and rails. Tribology of the railway bogie is an important part of transport tribology, the foundation of the theory of wheel-rail tribosystem, without which it is impossible to understand the mechanisms of catastrophic wear, derailments, contact fatigue, cohesion of wheels and rails. In the article basic questions are considered, without which it is impossible to analyze the movement of the bogie: physical foundations of wheel movement along the rail, types of relative motion of contacting bodies, tribological characteristics linking the force and kinematic parameters of the bogie. Kinematics and dynamics of a two-wheeled bogie-rail bicycle are analyzed instead of a single wheel and a wheelset, which makes it clearer and easier to explain how and what forces act on the bogie and how they affect on its position in the rail track. To calculate the motion parameters of a four-wheeled bogie, it is represented as two two-wheeled, moving each on its own rail. Connections between them are replaced by moments with respect to the point of contact between the flange of the guide wheel and the rail. This approach made it possible to give an approximate estimation of the main kinematic and force parameters of the motion of an ideal bogie (without axes skewing) in curves, to understand how the corners of the bogie installation and the gaps between the flanges of the wheels and rails vary when moving with different speeds, how wear and contact injuries arise and to give recommendations for their assessment and elimination.

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